Symbols & Numbers | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

## Index: Symbols & Numbers

### Symbols

< > (angle brackets)
  > as Bourne shell secondary prompt: 28.9.2. A for Loop
  > (greater than) operator: 36.21.1. Syntax
    41.5.1. Scalars
  >= (greater than or equal to) operator: 20.10.7. Alphabetical Summary of Commands
    36.21.1. Syntax
    41.5.1. Scalars
  > (redirection) operator: 43.5. Redirection in C Shell: Capture Errors, Too?
  > tcsh shell prompt: 1.7. Which Shell Am I Running?
  >& (redirection) operator: 43.5. Redirection in C Shell: Capture Errors, Too?
  >> (Unix redirect and append) operator: 17.12. Appending to an Existing File
  < (less than) operator: 20.10.7. Alphabetical Summary of Commands
    36.21.1. Syntax
    41.5.1. Scalars
  <= (less than or equal to) operator: 20.10.7. Alphabetical Summary of Commands
    36.21.1. Syntax
    41.5.1. Scalars
  < redirection character: 43.2. One Argument with a cat Isn't Enough
  <<- operator, removing tab characters: 27.16. Here Documents
  <<- operator, removing TABs with: 28.13. Here Document Example #1: Unformatted Form Letters
  << (here document) operator: 27.16. Here Documents
    28.13. Here Document Example #1: Unformatted Form Letters
  < >, enclosing event names: 6.4. X Event Translations
  <-> filename wildcard: 33.2. Filename Wildcards in a Nutshell
  < > regular expression metacharacters: 32.12. Regular Expressions: Matching Words with < and >
    32.20. Valid Metacharacters for Different Unix Programs
  <=> (comparison) operator in Perl: 41.5.1. Scalars
{ } (braces)
  { } regular expression metacharacters: 32.11. Regular Expressions: Matching a Specific Number of Sets with { and }
    32.20. Valid Metacharacters for Different Unix Programs
  awk procedures, enclosing: 20.10.2.1. Patterns
  dereferencing, use in: 41.5.4. References
  filename wildcards: 33.2. Filename Wildcards in a Nutshell
  find command: 9.9. Running Commands on What You Find
    9.17. Duplicating a Directory Tree
  GNU find command and: 9.9. Running Commands on What You Find
  in shells: 1.13. Wildcards
    33.3. Who Handles Wildcards?
  pattern-expansion characters
    building strings with: 28.4. Build Strings with { }
    for loop, using with: 28.9.2. A for Loop
    foreach loop, using with: 28.9.1. A foreach Loop
  quoting alias argument in: 29.3. C-Shell Aliases with Command-Line Arguments
  sed commands enclosed in: 34.20. Making Edits Everywhere Except...
  shell functions, using in: 29.11.2. Functions with Loops: Internet Lookup
  variable values, interpolating: 35.3. What Environment Variables Are Good For
[ ] (brackets)
  [^ ] filename wildcard: 33.2. Filename Wildcards in a Nutshell
  [ command: 35.26. test: Testing Files and Strings
    numeric tests, syntax errors: 37.3. Stop Syntax Errors in Numeric Tests
    string text syntax errors: 37.4. Stop Syntax Errors in String Tests
  bash shell prompts, nonprinting characters: 4.10. Highlighting and Color in Shell Prompts
  range operator: 21.11. Hacking on Characters with tr
  references to lists in Perl: 41.5.4. References
  regular expression metacharacters: 32.20. Valid Metacharacters for Different Unix Programs
    ^ (caret) within: 32.9. Regular Expressions: Exceptions in a Character Set
    character classes: 41.7. Perl Boot Camp, Part 4: Pattern Matching
    range, specifying: 32.8. Regular Expressions: Specifying a Range of Characters with [...]
  wildcards: 28.3. Use Wildcards to Create Files?
    33.2. Filename Wildcards in a Nutshell
    fast find commands, using with: 9.19. Wildcards with "Fast find" Database
- (dash)
  - numerical subtraction operator: 41.5.1. Scalars
  -> (dereferencing) operator: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
    41.5.4. References
  command-line arguments starting with: 35.21. Handling Command-Line Arguments with a for Loop
    35.22. Handling Arguments with while and shift
    35.24. Standard Command-Line Parsing
  double dashes, converting to em-dashes in sed: 34.20. Making Edits Everywhere Except...
  filenames starting with: 14.13. Handling a Filename Starting with a Dash (-)
  subtraction arithmetic operator: 36.21.1. Syntax
  with << operator: 27.16. Here Documents
( ) (parentheses)
  escaped-parenthesis operators in sed: 34.11. Referencing Portions of a Search String
    36.23.4. Using sed
  find command operator: 9.1. How to Use find
  regular expression metacharacters: 32.13. Regular Expressions: Remembering Patterns with (, ), and 1
    32.20. Valid Metacharacters for Different Unix Programs
  commands printed in by ps: 24.8. Why ps Prints Some Commands in Parentheses
  grouping operator: 13.5. grepping for a List of Patterns
    combining commands with: 43.7. The ( ) Subshell Operators
    extended regular expressions: 32.15. Extended Regular Expressions
    Perl regular expressions: 41.7. Perl Boot Camp, Part 4: Pattern Matching
    use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs
  nesting regular expressions in: 13.4. Extended Searching for Text with egrep
  operator precedence, overriding with: 32.3. Understanding Expressions
  Perl operators, resolving ambiguity in: 41.5.1. Scalars
  subshell operator: 3.3. Shell Setup Files — Which, Where, and Why
    43.9. How to tee Several Commands into One Place
& (ampersand)
  &| background operator, Z shell: 23.11. Disowning Processes
  & (logical AND) operator: 36.21.1. Syntax
  && (Boolean AND) operator: 10.13. Copying Directory Trees with tar and Pipes
    20.10.2.1. Patterns
    28.16. Separating Commands with Semicolons
    30.10. Running a Series of Commands on a File
    35.14. Testing Your Success
    41.3. Compiling Perl from Scratch
    41.5.1. Scalars
* (asterisk)
  ** filename wildcard (zsh): 33.2. Filename Wildcards in a Nutshell
  arithmetic operator (multiplication): 36.21.1. Syntax
  executable files, denoting in ls -F listings: 8.10. Useful ls Aliases
  filename wildcard: 33.2. Filename Wildcards in a Nutshell
    33.2. Filename Wildcards in a Nutshell
  multiplication operator: 41.5.1. Scalars
  regular expression metacharacter: 32.3. Understanding Expressions
    32.4. Using Metacharacters in Regular Expressions
    quantifier in Perl: 41.7. Perl Boot Camp, Part 4: Pattern Matching
    repeating character sets with: 32.10. Regular Expressions: Repeating Character Sets with *
    use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs
  shell metacharacter: 32.3. Understanding Expressions
  wildcard character: 1.13. Wildcards
    9.19. Wildcards with "Fast find" Database
@ (at sign)
  @ARGV array: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
  csh built-in operator: 28.4. Build Strings with { }
  filename wildcard: 33.2. Filename Wildcards in a Nutshell
  files as symbolic links, in ls -F listings: 8.10. Useful ls Aliases
  for array names: 41.5.2. Arrays
  in Perl array values: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
  @INC array: 41.2. Checking your Perl Installation
    41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
  kill character: 5.8. Setting Your Erase, Kill, and Interrupt Characters
` (backquotes)
  \`\`, nested command substitution: 36.24. Nested Command Substitution
  arguments, reading: 28.17. Dealing with Too Many Arguments
  capturing command output in an array: 41.7. Perl Boot Camp, Part 4: Pattern Matching
  command substitution operators: 5.3. Setting the Terminal Type When You Log In
    8.17. Picking a Unique Filename Automatically
    28.14. Command Substitution
    excluding files from deletion: 14.18. Removing Every File but One
    getopt, using with: 35.24. Standard Command-Line Parsing
    nesting: 28.14. Command Substitution
  command substitution with: 9.2. Delving Through a Deep Directory Tree
  expr command, running with: 36.22. Testing Characters in a String with expr
  for loops combined with: 36.11. Standard Input to a for Loop
  quoting in Bourne shell: 27.12.2. How Quoting Works
  redirecting standard output: 36.16. n>&m: Swap Standard Output and Standard Error
\ (backslash)
  \ ( \ ) regular expression metacharacters: 32.13. Regular Expressions: Remembering Patterns with (, ), and 1
    32.20. Valid Metacharacters for Different Unix Programs
  \1, \2, ... metacharacters, recalling remembered patterns: 32.13. Regular Expressions: Remembering Patterns with (, ), and 1
  \ { \ } regular expression metacharacters: 32.11. Regular Expressions: Matching a Specific Number of Sets with { and }
    32.20. Valid Metacharacters for Different Unix Programs
  \! operator (C shell): 29.3. C-Shell Aliases with Command-Line Arguments
    29.4. Setting and Unsetting Bourne-Type Aliases
  in alias quoting: 29.3. C-Shell Aliases with Command-Line Arguments
  escaping regular expression delimiters in sed: 34.8. Delimiting a Regular Expression
  escaping regular expression metacharacters: 32.5. Regular Expressions: The Anchor Characters ^ and $
  extended regular expressions and: 32.15. Extended Regular Expressions
  in X Window System resource definitions: 6.3. X Resource Syntax
  multiline pipes in C shell scripts: 35.19. Shell Script "Wrappers" for awk, sed, etc.
  multiple-line statements in Python: 42.3.1. Indentation
  before newline, shell quoting and: 27.12.4. Multiline Quoting
    27.13.2. How Quoting Works
  Perl variables, preventing interpolation in: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
  in prompt settings: 4.15. External Commands Send Signals to Set Variables
  quoting newlines in sed: 34.24. sed Newlines, Quoting, and Backslashes in a Shell Script
  regular expression metacharacters
    \< \> matching words with: 32.12. Regular Expressions: Matching Words with < and >
    use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs
  in shell quoting: 27.12. Bourne Shell Quoting
    Bourne shell: 27.12.2. How Quoting Works
    C shell: 27.13. Differences Between Bourne and C Shell Quoting
  shell, terminal and program quoting, conflicts in: 27.18. How Many Backslashes?
\ (backspace), stripping from formatted manpages: 2.4. Searching Online Manual Pages
^ (caret)
  [^ ] filename wildcard: 33.2. Filename Wildcards in a Nutshell
  ^[ (ESC character): 8.6.1. Trying It
  ^ ^ sequence in history substitution: 30.5. My Favorite Is ^^
  beginning of line anchor in regular expressions: 32.4. Using Metacharacters in Regular Expressions
    32.5. Regular Expressions: The Anchor Characters ^ and $
  beginning of line indicator in various utilities: 32.5. Regular Expressions: The Anchor Characters ^ and $
  filename wildcard: 33.2. Filename Wildcards in a Nutshell
  in control keys: 5.8. Setting Your Erase, Kill, and Interrupt Characters
  regular expression metacharacter
    matching at beginning of line (Perl): 41.7. Perl Boot Camp, Part 4: Pattern Matching
    matching newline at the beginning of a multiline pattern space: 34.16. Making Edits Across Line Boundaries
    negating character classes with: 32.18. Limiting the Extent of a Match
    use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs
    within [ ] metacharacters: 32.9. Regular Expressions: Exceptions in a Character Set
  ^xy^yx, shorthand substitution command: 30.8. History Substitutions
: (colon)
  between item=attribute values: 8.6.2. Configuring It
  Bourne shell operator: 36.6. The Unappreciated Bourne Shell ":" Operator
    parameter substitution, use in: 36.7. Parameter Substitution
  command in vi: 17.2. What We Cover
    17.30. Setting Up vi with the .exrc File
  in command-line options: 35.24. Standard Command-Line Parsing
  ex commands, issuing from vi: 20.4. Useful ex Commands
  logical operator: 36.21.1. Syntax
    36.21.2. Examples
  as null character: 35.13. Test Exit Status with the if Statement
  :p operator, printing command without executing it: 30.11. Check Your History First with :p
  separating fields: 1.7. Which Shell Am I Running?
    5.6. Checklist: Terminal Hangs When I Log In
  separating terminal type values: 5.3. Setting the Terminal Type When You Log In
  shell script comments: 36.2. The Story of : # #!
  string editing operators: 28.5. String Editing (Colon) Operators
  translation table, event and action mappings: 6.4. X Event Translations
, (comma) in filenames: 1.11. Filenames
$ (dollar sign)
  $( ) command substitution operator: 28.14. Command Substitution
    36.24. Nested Command Substitution
  $1, $2, etc., command-line arguments in: 29.11.3. Setting Current Shell Environment: The work Function
  $- variable, displaying current flags: 3.4.2. Interactive Shells
  $* argument: 36.23.1. Matching with expr
    37.5. Quoting and Command-Line Parameters
  $# command-line argument: 35.20.3. Counting Arguments with $#
  $1 command-line arguments: 35.16. Set Exit Status of a Shell (Script)
    35.20. Handling Command-Line Arguments in Shell Scripts
  $0 parameter, script names in: 35.28. Finding a Program Name and Giving Your Program Multiple Names
  $_ variables in Perl: 41.5.1. Scalars
    41.6. Perl Boot Camp, Part 3: Branching and Looping
  in bash shell prompt: 1.7. Which Shell Am I Running?
    4.3. Dynamic Prompts
  inside double quotes in C shell quoting: 27.13.2. How Quoting Works
  end of line anchor in regular expressions: 32.5. Regular Expressions: The Anchor Characters ^ and $
  end of line indicator in various utilities: 8.11. Can't Access a File? Look for Spaces in the Name
    32.5. Regular Expressions: The Anchor Characters ^ and $
  $Id $ in RCS files: 39.5. RCS Basics
  metacharacter in regular expressions and shells: 27.17. "Special" Characters and Operators
  quoting in Bourne shell: 27.12.2. How Quoting Works
  regular expression metacharacter
    matching at end of line (Perl): 41.7. Perl Boot Camp, Part 4: Pattern Matching
    matching newline at the end of multiline pattern space: 34.16. Making Edits Across Line Boundaries
    use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs
  sed addressing symbol: 34.5. sed Addressing Basics
  value of Bourne shell exit status variable (?), getting: 35.12. Exit Status of Unix Processes
  variable names, preceding: 35.3. What Environment Variables Are Good For
    35.9. Shell Variables
    41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
  as wildcard: 35.11. Pattern Matching in case Statements
. (dot)
  . and .. in directories: 10.2. What's Really in a Directory?
    10.4.2. Links to a Directory
  . and .. in pathnames: 1.16. Making Pathnames
  . command, reading files with: 35.29. Reading Files with the . and source Commands
  ./ (dot slash), filenames beginning with: 14.13. Handling a Filename Starting with a Dash (-)
  .. (integer-range) operator in zsh: 28.4. Build Strings with { }
  . (string concatenation) operator: 41.5.1. Scalars
  in filenames: 1.11. Filenames
    1.13. Wildcards
  filenames beginning with: 14.16. Problems Deleting Directories
    ls command and: 8.9. Showing Hidden Files with ls -A and -a
    wildcards and: 33.2. Filename Wildcards in a Nutshell
  regular expression metacharacter: 32.3. Understanding Expressions
    matching any character (except newline) in Perl: 41.7. Perl Boot Camp, Part 4: Pattern Matching
    matching any character with: 32.7. Regular Expressions: Match Any Character with . (Dot)
    use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs
  relative pathname for current directory: 31.3. What Good Is a Current Directory?
  repeat command in vi editor: 17.7. Get Back What You Deleted with Numbered Buffers
= (equal sign)
  == (numeric equality) operator: 41.5.1. Scalars
  =~ (pattern binding) operator: 41.7. Perl Boot Camp, Part 4: Pattern Matching
  == (relational) operator: 20.10.7. Alphabetical Summary of Commands
  in alias definitions: 29.4. Setting and Unsetting Bourne-Type Aliases
    29.6. zsh Aliases
  assignment operator: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
  => (fat comma) operator in Perl: 41.5.3. Hashes
  relational operator: 36.21.1. Syntax
    36.21.2. Examples
  socket files: 8.10. Useful ls Aliases
! (exclamation point)
  [! ] filename wildcards: 33.2. Filename Wildcards in a Nutshell
  ! (Boolean NOT) operator: 20.10.2.1. Patterns
  ! (logical negation) operator: 9.1. How to Use find
    41.5.1. Scalars
    with find command: 9.8. Exact File-Time Comparisons
  != (not equal) operator: 20.10.7. Alphabetical Summary of Commands
    36.21.1. Syntax
    41.5.1. Scalars
  !~ (pattern-matching) operator: 20.10.7. Alphabetical Summary of Commands
  !$, specifying last argument on previous line: 32.5. Regular Expressions: The Anchor Characters ^ and $
  in C shell quoting: 27.13.2. How Quoting Works
  command line exit status, reversing in bash and zsh: 35.12. Exit Status of Unix Processes
  filename wildcard: 33.2. Filename Wildcards in a Nutshell
  filtering vi text through Unix command: 17.18. Filtering Text Through a Unix Command
  find command operator: 13.3. Finding Text That Doesn't Match
  history substitution commands: 30.8. History Substitutions
    !! and !: sequences: 30.8. History Substitutions
    !$ notation: 29.3. C-Shell Aliases with Command-Line Arguments
    !$ sequence: 30.3. My Favorite Is !$
      30.6. Using !$ for Safety with Wildcards
      30.8. History Substitutions
    bash shell quoting and: 27.12.1. Special Characters
    !:n* sequence: 30.4. My Favorite Is !:n*
  regular expression metacharacter
    sed editor replacements: 34.20. Making Edits Everywhere Except...
  sed address followed by: 34.5. sed Addressing Basics
  test command using: 35.26. test: Testing Files and Strings
  in X Window System comments: 6.3. X Resource Syntax
# (hash mark)
  # and ## filename wildcards: 33.2. Filename Wildcards in a Nutshell
  : (colon) used in place of: 36.6. The Unappreciated Bourne Shell ":" Operator
  #! notation: 27.3.6. Default Commands
    36.2. The Story of : # #!
    in Bourne shell scripts: 35.1. Writing a Simple Shell Program
    in Perl scripts: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
  in comments: 36.2. The Story of : # #!
    # $Id $, commenting RCS files in a shell or Perl script: 39.5. RCS Basics
  dynamic prompts in tcsh and zsh shells: 4.3. Dynamic Prompts
  erase character: 5.8. Setting Your Erase, Kill, and Interrupt Characters
  in crontab entries: 25.2.1. Execution Scheduling
  shell prompt for zsh shells: 27.12.2. How Quoting Works
  vi editor, alternate filename: 17.3. Editing Multiple Files with vi
% (percent sign)
  %?, prefixing job numbers: 23.3. Using jobs Effectively
  arithmetic operator (modulus): 36.21.1. Syntax
  formatting operator in Python: 42.3.5. I/O and Formatting
  in shell prompts
    %{ and %} delimiters for nonprinting escape sequences: 4.10. Highlighting and Color in Shell Prompts
    %# (dynamic prompt), tcsh and zsh shells: 4.3. Dynamic Prompts
    %! for zsh hisotry number: 4.3. Dynamic Prompts
    C (csh) shell: 1.7. Which Shell Am I Running?
  vi editor, current filename: 17.3. Editing Multiple Files with vi
+ (plus sign)
  ++ (autoincrement) operator: 41.5.1. Scalars
  + operator (one or more): 13.3. Finding Text That Doesn't Match
  addition (arithmetic) operator: 32.3. Understanding Expressions
    36.21.1. Syntax
    41.5.1. Scalars
  data command option: 8.17. Picking a Unique Filename Automatically
  filename wildcard: 33.2. Filename Wildcards in a Nutshell
  in job numbers: 23.3. Using jobs Effectively
  regular expression metacharacter: 13.4. Extended Searching for Text with egrep
    32.15. Extended Regular Expressions
    32.20. Valid Metacharacters for Different Unix Programs
    quantifier in Perl: 41.7. Perl Boot Camp, Part 4: Pattern Matching
? (question mark)
  ?*) wildcard metacharacters in case statements: 35.11. Pattern Matching in case Statements
  Bourne shell variable for command exit status: 35.12. Exit Status of Unix Processes
  filename wildcard: 33.2. Filename Wildcards in a Nutshell
    33.2. Filename Wildcards in a Nutshell
  nonprinting characters, converting to with ls -q: 8.12. Showing Nonprintable Characters in Filenames
  regular expression metacharacter: 13.4. Extended Searching for Text with egrep
    32.15. Extended Regular Expressions
    quantifier in Perl: 41.7. Perl Boot Camp, Part 4: Pattern Matching
    use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs
  as secondary shell prompt: 28.9.1. A foreach Loop
  shell wildcard, matching with fast find commands: 9.19. Wildcards with "Fast find" Database
  wildcard character: 1.13. Wildcards
" (quotes, double)
  $ and ' inside, in C shell quoting: 27.13.2. How Quoting Works
  around filenames, renaming files and: 10.9. Renaming, Copying, or Comparing a Set of Files
  converting straight quotes to curly quotes with sed: 34.20. Making Edits Everywhere Except...
  for comments in vi .exrc file: 17.30. Setting Up vi with the .exrc File
  in command arguments: 1.4. Communication with Unix
  in prompts: 4.2. Static Prompts
    4.6. Faster Prompt Setting with Built-ins
    4.7. Multiline Shell Prompts
    4.10. Highlighting and Color in Shell Prompts
  in regular expressions: 13.4. Extended Searching for Text with egrep
  in sed scripts: 37.8. Cleaning script Files
  in shell quoting: 27.12. Bourne Shell Quoting
    27.12.2. How Quoting Works
    27.13. Differences Between Bourne and C Shell Quoting
  ls -Q command output: 8.11. Can't Access a File? Look for Spaces in the Name
  passing wildcards to programs: 33.3. Who Handles Wildcards?
  search patterns in csplit program: 21.10. Splitting Files by Context: csplit
  shell arrays, expanded values: 9.23.2. Expanding Ranges
  variable interpolation in Perl: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
  wildcard pattern matching in case statements: 35.11. Pattern Matching in case Statements
' (quotes, single)
  ; (semicolon), using with in C shell: 9.9. Running Commands on What You Find
  around filenames, renaming files and: 10.9. Renaming, Copying, or Comparing a Set of Files
  in alias quoting: 29.3. C-Shell Aliases with Command-Line Arguments
    29.4. Setting and Unsetting Bourne-Type Aliases
  in bash pre-prompt commands: 4.16. Preprompt, Pre-execution, and Periodic Commands
  in prompts: 4.2. Static Prompts
    4.7. Multiline Shell Prompts
    4.10. Highlighting and Color in Shell Prompts
  in shell quoting: 27.12. Bourne Shell Quoting
    27.12.2. How Quoting Works
    27.13. Differences Between Bourne and C Shell Quoting
    inside double quotes (C shell): 27.13.2. How Quoting Works
  passing wildcards to programs: 33.3. Who Handles Wildcards?
  regular expressions, quoting: 32.2. Don't Confuse Regular Expressions with Wildcards
  strings in case statements: 35.11. Pattern Matching in case Statements
; (semicolon)
  code separator in color escape sequences: 8.6.1. Trying It
  separating awk procedures: 20.10.2.1. Patterns
  separating commands: 28.16. Separating Commands with Semicolons
    35.17. Trapping Exits Caused by Interrupts
    in case statements: 35.10. Test String Values with Bourne-Shell case
    find -exec and: 9.9. Running Commands on What You Find
  in shell functions: 29.11.1. Simple Functions: ls with Options
/ (slash)
  /* $Id $ */, commenting C program RCS files: 39.5. RCS Basics
  /*/* wildcard metacharacters in case statements: 35.11. Pattern Matching in case Statements
  arithmetic operator (division): 36.21.1. Syntax
  arithmetic opertor (division): 41.5.1. Scalars
  Bourne-type shells, quoting and: 27.12.1. Special Characters
  delimiter for regular expressions in sed: 34.8. Delimiting a Regular Expression
  directory, denoting in ls -F listings: 8.10. Useful ls Aliases
  in filenames: 1.11. Filenames
    1.13. Wildcards
  in pathnames: 1.16. Making Pathnames
    31.2. Using Relative and Absolute Pathnames
    absolute pathnames: 1.9. Internal and External Commands
    tar archives and: 38.6.1. Restoring a Few Files
    wildcard matching across: 38.10.2. With GNU tar
  search patterns in vi editor, delimiting: 17.8. Using Search Patterns and Global Commands
  shell, treatment of: 9.19. Wildcards with "Fast find" Database
~ (tilde)
  ~ and !~ (pattern-matching) operators: 20.10.7. Alphabetical Summary of Commands
  abbreviation for any directory: 29.5. Korn-Shell Aliases
  filenames ending with: 31.11. Finding (Anyone's) Home Directory, Quickly
    Emacs backup files: 1.12. Filename Extensions
      8.7. Some GNU ls Features
  for home directory: 3.7. Use Absolute Pathnames in Shell Setup Files
    7.2. Many Homes
    31.11. Finding (Anyone's) Home Directory, Quickly
  in pathnames: 1.16. Making Pathnames
_ (underscore)
  ASCII class for: 5.14. Defining What Makes Up a Word for Selection Purposes
  in filenames: 1.11. Filenames
| (vertical bar)
  || (Boolean OR) operator: 20.10.2.1. Patterns
    28.16. Separating Commands with Semicolons
    35.13. Test Exit Status with the if Statement
    41.5.1. Scalars
    testing scripts with: 35.14. Testing Your Success
  alternation operator: 13.4. Extended Searching for Text with egrep
    13.5. grepping for a List of Patterns
    41.7. Perl Boot Camp, Part 4: Pattern Matching
  |& operator: 43.5. Redirection in C Shell: Capture Errors, Too?
  bitwise or operator: 41.4. Perl Boot Camp, Part 1: Typical Script Anatomy
  command separator in ex editor: 17.14. Useful Global Commands (with Pattern Matches)
  filename wildcard: 33.2. Filename Wildcards in a Nutshell
  files, named pipe (FIFO): 8.10. Useful ls Aliases
  logical OR operator: 36.21.1. Syntax
  noclobber variable and: 43.6. Safe I/O Redirection with noclobber
  pipes: 1.5. Programs Are Designed to Work Together
    redirecting standard output: 36.16. n>&m: Swap Standard Output and Standard Error
      36.16. n>&m: Swap Standard Output and Standard Error
  regular expression metacharacter
    alternation in pattern matching: 32.15. Extended Regular Expressions
    use in Unix programs: 32.20. Valid Metacharacters for Different Unix Programs
  separating multiple ex editor commands: 18.6. Protecting Keys from Interpretation by ex
  wildcard metacharacter in case statements: 35.11. Pattern Matching in case Statements

### Numbers

:0 (zero) operator, in history substitutions: 30.8. History Substitutions
0 (zero) process ID: 24.14. Killing All Your Processes
-1 process ID: 24.14. Killing All Your Processes

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